BTD4 features improved graphics, loads of new and original tower types and tons of upgrades for each tower type. Heaps of tracks, save games, career mode, sandbox mode and apopalypse mode. Bloons Tower Defense 4 will give you almost unlimited replay value. Use Kreds to purchase optional game content and upgrades!
I hate all Bloons games.
The art direction is severely lacking, they don't have grid placement and the enemies are retarded balloons. I don't want to shoot balloons, I want to shoot robots, undead or something that bleeds.